Fukushima suicide: 'Unspeakable rage'

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The lives of Japan nuclear workers

The reactor is due to start providing some electricity to western Japan -- which includes Osaka, Japan's second-biggest city -- by Wednesday. Ohi's No. 4 reactor is scheduled to resume operations by July 24.

All 50 commercial nuclear reactors in Japan have been offline since May 5 for safety checks. The government has been conducting simulation tests for restarting its nuclear reactors in response to public concerns over their safety in the wake of the Fukushima Daiichi crisis last year.

Before the March 2011 nuclear disaster, Japan had relied on nuclear energy for about 30% of its electricity needs, according to government figures.

Though no deaths have been attributed to the nuclear accident, the earthquake and tsunami killed more than 15,000 people in northeastern Japan. The damaged Fukushima spewed radiation, prompting the government to evacuate tens of thousands of people.